Afternoon.

Captain Huang Qiangming of the Criminal Investigation Division walked around the fourth floor again. He mainly went to the forensic office to have a conversation.

Lu Jianfeng, the captain of the Criminal Science and Technology Unit, accompanied him enthusiastically.

Lu Jianfeng was also a technical star in the Criminal Science and Technology Unit. However, that was more than ten years ago. At that time, Lu Jianfeng, who was doing drug testing, established the first drug testing laboratory in Ningtai County and successfully solved several drug-related cases, receiving many commendations.

But with fewer and fewer drug-related cases in recent years, and the demand for chemical testing being low, drug testing has almost become a physical examination post. Lu Jianfeng's work has gradually shifted towards administration.

Huang Qiangming praised the recent performance of the Criminal Science and Technology Unit, releasing a high-intensity smile, and particularly praised Jiang Yuan's "courage to take on responsibilities."

In the county bureau, forensic science is a highly sought-after field, and high-level trace evidence analysis is even more so.

A high-level trace evidence analyst can directly point to the culprit, saving everyone a lot of work and improving the case-solving rate. This is not only the basis for receiving commendations and awards but also can improve everyone's work completion rate. To put it in a larger sense, it can also increase everyone's sense of identity with the police work.

Solving cases has never been a simple job or task.

This has remained unchanged from ancient times to the present. The daily special post allowance of one or two hundred yuan has never been a reason for overtime.

After this group of people dispersed, Wei Zhenguo smiled and approached.

Wei Zhenguo brought someone with him and said, "Mu Zhiyang, you've met him before. Let him follow you for a few days, go to the police station, make an inquiry record, and watch some videos. It's no problem."

"Great." Jiang Yuan couldn't really let an old detective follow him to find an electric bike. He smiled at Mu Zhiyang, who was of a similar age, and said, "Mu is a rare surname."

"It's not common in our area either. It is said that there was a minister named Li Mu in the Yellow Emperor's court, and his descendants used his name as their surname. I came here from another place." Mu Zhiyang obviously introduced himself with his surname a lot.

Wei Zhenguo summarized on the side, "Young people who come from other places to take the exam have simple social relationships and are easy to work with. They have no family burden and are willing to work overtime. They are educated and can handle cases well. If someone else wants Mu Zhiyang, I won't send him over."

Jiang Yuan expressed his gratitude again and said, "I've finished those fingerprints. I'll ask Wang Zhong to send them to you later."

Police cases are never-ending, and the to-do lists of each Criminal Investigation Division are always full. Similarly, the fingerprint lists that everyone needs to do are never-ending.

Unlike latent fingerprints, each current case may involve many fingerprints, most of which are not decisive.

The police in charge of solving the case hope to do as many fingerprint comparisons as possible, but the technical police in the Criminal Science and Technology Unit may never be able to meet their expectations, even in homicide cases, it is impossible to process all kinds of evidence infinitely carefully, let alone other cases.

Jiang Yuan is not a trace evidence analyst, but he can choose to do fingerprints. He can help Wei Zhenguo by doing more fingerprints in advance, even if it is compensated by the Sixth Team police.

Mu Zhiyang, who was sold at a good price, happily followed Jiang Yuan and started watching video recordings in the office.

The videos were copied by Jiang Yuan from the property management, including the records of eight cameras in the past three months, with a huge amount of data.

Even the property management staff were too lazy to watch these recordings, let alone the detectives.Mu Zhiyang and Jiang Yuan watched the video from four cameras, playing them simultaneously on the screen. They watched so fast that it made them dizzy.

After a while...

"Found it. This is... Jiang Yongxin's electric bike." Mu Zhiyang, who had more experience, operated the controls and finally found the right time point. He watched it again and paused, saying, "It was forced open."

Jiang Yuan paused his own video and turned to look.

They saw a man in a tactical vest walking along a row of electric bikes, pretending to make a phone call. He strolled around while selecting a vehicle.

After about a minute, he picked one of the electric bikes, looked around, took something out of his pocket, got on the bike, inserted it, twisted it hard, and the bike started.

"Is he stealing it?" Jiang Yuan asked, looking puzzled.

Mu Zhiyang nodded and said, "It's stealing by forced entry. There's no skill involved. He used a universal key, which comes in several types, including straight and cross-shaped. He found a non-spinning lock core, inserted the universal key, twisted it hard, and broke the lock core. Then he drove the bike away."

"Can the lock core be broken?"

"These lock cores are made of copper. His universal key is made of steel, and some are made of alloy steel. As long as it's not a magnetic lock and not a spinning lock core, it can be broken." Mu Zhiyang made a note in his notebook and said, "He didn't wear gloves, but he didn't touch anything other than the electric bike."

"This is a clean job." Jiang Yuan, with his level 4 crime scene investigation skills, scrutinized the scene in the video and couldn't find any flaws in the thief's work.

This was one of the reasons why stealing electric bikes was not well received. The thief who forced the lock did not leave much information because stealing electric bikes was too simple.

One of the basic principles of criminal investigation is the Locard principle, which states that when two objects come into contact, there will be a transfer of material, that is, something will be taken away and something will be left behind.

The thief who stole the electric bike came into contact with the bike and took the whole thing away, leaving only footprints behind...

Footprints are not like fingerprints, they can only be used as evidence. Moreover, after so long, footprints in public places are definitely not preserved.

If it weren't for the video recording, the case would be more difficult to solve than a murder case. Even if there was no evidence at the scene of a murder, the motive could be found through interpersonal relationships. In fact, most murder cases are solved this way. But stealing electric bikes, how could there be any interpersonal relationships involved...

Of course, in general, stealing electric bikes is not as complex as a murder case. The suspect's own vigilance and operational capabilities are limited, and they are likely to appear in video surveillance, which can explain the problem itself.

If they really want to follow the scene, there are still ways to do it. They can follow the video surveillance of the day of the crime and find other video surveillance along the way to track it. There is still a high probability of finding clues.

If there is no hope on the road, they can follow the suspect's place of residence or places they may pass by again, or directly use the criminal investigation tool to investigate. There is still a chance of finding the suspect.

However, these methods are not available to Jiang Yuan."Let's watch the next video." Jiang Yuan only thought for a short while before giving up on the scene.

His goal was only to help find a few electric bikes, not all of them.

"Then let's continue watching the footage." Mu Zhiyang was used to this. He had helped people find things before, and the easy ones were easy, but the difficult ones were really troublesome.

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Following the police records of Jiangcun Community, the two soon saw another case of electric bike theft in broad daylight. The thief was actually the same person, using similar methods. The only difference was that the other party had also pried open a U-lock and threw it into a nearby trash can.

"Here." Jiang Yuan pointed with his hand and immediately made a note.

"The video is from a month ago, and the discarded U-lock is probably not recoverable." Mu Zhiyang was a bit regretful, saying, "The residents reported the case late, and the police on duty didn't pay attention to protecting the scene, which is also a problem."

Jiang Yuan waved his hand and played the surveillance video forward a few seconds, pointing to the screen and saying, "When he unlocked the U-lock, he supported the bottom of the pillar with his hand."

The pillar was made of I-beams, and the position where the other party's fingers were hooked in was on the inside and lower side, which was not a place that ordinary people would normally touch, so there was a high probability of leaving fingerprints.

However, after a month, fingerprints were already in a mystical state, and it was normal to leave or not leave fingerprints.

"Should we go over now?" Mu Zhiyang asked.

"No rush, let's look at other things first, and then collect samples together later."

"Do you want to ask the local police station to go over first?"

"No." Jiang Yuan refused outright, saying, "It's been too long, I'd rather go myself to be sure."

Mu Zhiyang had no objections, but he felt it was unnecessary.